What agricultural techniques are described in Book XVIII of Natural History?

In Book XVIII of his Natural History, Pliny the Elder provides significant insights into Roman agricultural practices. This book is considered a vital source for understanding the following techniques and topics:

• Crop rotation: Pliny documents the practice of alternating crops to maintain soil productivity.
• Farm management: He discusses the organizational aspects of running agricultural estates.
• Crop Identification: The text provides the names of various legumes and other cultivated plants, and by recording Latin synonyms for Greek plant names, he helped make many species identifiable to later scholars.
• Agricultural Technology: Pliny describes an ox-driven grain harvester used in Gaul. While this was once dismissed by scholars as imaginary, its existence was later confirmed by the 1958 discovery of a 2nd-century stone relief depicting the implement.

Pliny’s work remains a primary reference for the history of Roman gardens and the introduction of new horticultural and agricultural species into Italy.1